Chain saw



FIG. 1 is a perspective view of a chain saw showing my new design.

FIG. 2 is a right side view of a chain saw according to FIG. 1.

FIG. 3 is a left side view of a chain saw according to FIG. 1.

FIG. 4 is a front view of a chain saw according to FIG. 1.

FIG. 5 is a rear view of a chain saw according to FIG. 1.

FIG. 6 is a bottom view of a chain saw according to FIG. 1; and,

FIG. 7 is a top view of a chain saw according to FIG. 1.

In the above drawings the broken lines and the areas within the broken lines form no part of the claimed design. 

The ornamental design for a chain saw, as shown and described. 